Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2cb4feb9ab00cc…

MALICIOUS

PDF

133.1 KB Created: 2021-07-22 20:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d315876f0362e35b931bbabe4b04171 SHA-1: 2537a651fd27fca103b1b277cba22e8e4bd8d5d4 SHA-256: 0b2cb4feb9ab00cc387aa94440dfd3d6c73387fc78144881f9766a64c4b54175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern involves directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://maximaviajes.com/FCKfiles/file/30438675667.pdf In PDF document text
    • http://hanhthien.net/uploads/file/gegopemesona.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/vagexalekukip.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d2154ed2---letadominuzub.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/reseruvilifemuxofefu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9801e5d65c7bf3a01390fb86c87f4411/tudege.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/18328700263.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9af13665e2dd9f4f877b876663e8ade6/25654754244.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dogapa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f665bb27---zaluwigimi.pdfIn PDF document text
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/mefejonanogarebunaga.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/87571702226.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/38768865462.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/22268945105.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/naxagekofimevifaka.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21443047585.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j1oe3gaelkh58chqqtqqa6il8m/34132295013.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/34644350044.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/viwagosijepode.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/40c979f919d07079f33dbe0671b79a82/zirowemarik.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c5750d8115ad51f8a828e820366a7109/60628116145.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g3b5fvl4entha19m8c642vn097/4812263365.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/35090703828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=encouraging+words+that+start+with+rPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C257 10640 bytes
SHA-256: 3d37e3e6cc374dd63146bd3891c79de1c30e01cf590e2494b6f924f39068ae23
font_02_sfnt_off0001da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA7F 17084 bytes
SHA-256: 177fc43c2c10199dd8cc988b4664b3cd0c5c629cb0946ae8507ff091ce008a75

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